And I've found this .. B1 1+-v-+16 Vcc B2 2| |15 A2 B3 3| |14 A1 A3 4| |13 A0 S=A+B+Cn Cn 5| |12 B0 Cn+4=OUT Cn+4 6| |11 S0 S2 7| |10 S1 GND 8+---+9 S3 Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________